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Abstract
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Article Information:
Sensitivity of Progeny of Phytophthora infestans to Fungicides
Diana M. Earnshaw and Richard C. Shattock
Corresponding Author: Diana M. Earnshaw
Submitted: March 03, 2012
Accepted: March 24, 2012
Published: May 05, 2012 |
Abstract:
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This study investigated fungicide sensitivity of progeny of Phytophthora infestans at the University
of Wales, Bangor. Sexual progeny were derived from an A2 parent that was Metalaxyl Sensitive (MS) with
three A1 parents that were: MS, MS and MR (metalaxyl resistant). Sporangial and zoosporangial progeny from
the parent and from some sexual progeny were also assessed. The different isolates were grown on Rye B Agar
amended with different concentrations of one of five different fungicides: Metalaxyl, Propamocarb
hydrochloride, Cymoxanil, Fluazinam and Azoxystrobin. The results indicated that in metalaxyl, the sensitivity
of sporangial progeny was similar to that of the parent isolates, however that of zoosporangial progeny ranged
from being Intermediate (MI) to being Resistant (MR) if the parents were Resistant (MR) or from Sensitive
(MS) to being Intermediate (MI) if the parents were Sensitive (MS). No resistance was observed among
progeny that were exposed to Azoxystrobin. With the other fungicides, there was a variation in the sensitivity
of sporangial and zoosporangial progeny e.g. some sensitive sporangia gave rise to highly resistant zoospores.
The results showed that resistance to the most commonly used fungicides against late blight is possible.
Although no resistance to the new fungicide azoxystrobin was observed, the appearance of resistance to it
among other fungal pathogens has been reported. Therefore, breeders are faced with a challenge of coming up
with cultivars with reduced susceptibility to late blight and plant pathologists are to come up with a wide range
of fungicides so that their use can be rotated to avoid build-up of resistance isolates.
Key words: Azoxystrobin, cymoxanil, fungicide resistance, metalaxyl sensitivity, phenylamides, Phytophthora infestans, propamocarb hydrochloride
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Cite this Reference:
Diana M. Earnshaw and Richard C. Shattock, . Sensitivity of Progeny of Phytophthora infestans to Fungicides. Asian Journal of Agricultural Sciences, (3): 213-224.
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ISSN (Online): 2041-3890
ISSN (Print): 2041-3882 |
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